How to Measure Threads

September 17, 2021 2:57 pm


Welcome back to Northeast Wisconsin Technical College, today Matt Schmelzer is breaking down the process of measuring threads to make sure they meet specifications.

0:44 Thread specifications
3:11 Referencing the Machinery Handbook for thread inspection
5:23 Using ring gages for thread inspection
7:09 Measuring pitch diameter with a micrometer
9:57 Measuring threads with a micrometer
11:00 Using the three wire method to measure threads

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  • is9582 says:

    I enjoyed the video. I did have a question that arose while watching. In the latter part of the video when the instructor was explaining how to determine the correct wire size to use, the calculation providing the expected measurement result was 2.005″. The micrometer chosen to perform the measurement, was the 1″ – 2″ size. With an expected measurement size greater than 2″, is it acceptable to use a 1″ – 2″ micrometer? I am no professional (obvious I’d expect to the seasoned machinists) and may not even qualify as a novice, but I really do enjoy learning, and I’d have thought the target micrometer would have been a 2″ – 3″ unit. Help this newb old guy please.

    Thank you for any clarification you might provide,

    • Joe says:

      The micrometer chosen is valid. Even though the designation is 1″ to 2″, the micrometer will accurately measure at least an additional 0.100 without any problem. The machinist will, however, have to count the thimble revolutions past the 2″ mark. For measurements slightly over 2″, the mike is easier to hold (weighs less than the 2″ to 3″, and is smaller)

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